Abstract
The mechanism of action of the postemergence herbicide, diclofop-methyl (DM), and other aryloxyphenoxypropionic acid esters (AOPP) has been a topic of controversy due to the absence of definitive evidence implicating a specific mechanism. Two models have been proposed for the mode of action of diclofop-methyl. Model 1 is a single site-single effect mechanism that involves the inhibition of acetyl-CoA carboxylase (ACCase), a key enzyme in fatty acid biosynthesis. It is believed that by limiting the supply of long-chain fatty acids the biosynthesis of cellular membranes will be affected to cause lethality. With few exceptions, positive correlations exist between in vitro sensitivity of ACCase and whole plant resistance or susceptibility (Powles and Preston, 1995 and ref. therein). However, it is not certain that limiting the in vivo supply of fatty acids alone will cause the rapid lethality that has been observed in susceptible plants treated with DM.
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Shimabukuro, R.H., Hoffer, B.L. (1997). Perturbation of the Transmembrane Proton Gradient and Resistance to AOPP Herbicides. In: De Prado, R., JorrÃn, J., GarcÃa-Torres, L. (eds) Weed and Crop Resistance to Herbicides. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5538-0_7
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DOI: https://doi.org/10.1007/978-94-011-5538-0_7
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